gstreamer/sys/applemedia/corevideobuffer.c

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/*
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* Copyright (C) 2010 Ole André Vadla Ravnås <oleavr@soundrop.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "corevideobuffer.h"
static void
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gst_core_video_meta_free (GstCoreVideoMeta * meta, GstBuffer * buf)
{
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if (meta->pixbuf != NULL) {
CVPixelBufferUnlockBaseAddress (meta->pixbuf, kCVPixelBufferLock_ReadOnly);
}
CVBufferRelease (meta->cvbuf);
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}
GType
gst_core_video_meta_api_get_type (void)
{
static volatile GType type;
static const gchar *tags[] = { "memory", NULL };
if (g_once_init_enter (&type)) {
GType _type = gst_meta_api_type_register ("GstCoreVideoMetaAPI", tags);
g_once_init_leave (&type, _type);
}
return type;
}
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static const GstMetaInfo *
gst_core_video_meta_get_info (void)
{
static const GstMetaInfo *core_video_meta_info = NULL;
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if (g_once_init_enter (&core_video_meta_info)) {
const GstMetaInfo *meta = gst_meta_register (GST_CORE_VIDEO_META_API_TYPE,
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"GstCoreVideoMeta", sizeof (GstCoreVideoMeta),
(GstMetaInitFunction) NULL,
(GstMetaFreeFunction) gst_core_video_meta_free,
(GstMetaTransformFunction) NULL);
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g_once_init_leave (&core_video_meta_info, meta);
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}
return core_video_meta_info;
}
GstBuffer *
gst_core_video_buffer_new (CVBufferRef cvbuf, GstVideoInfo * vinfo)
{
void *data;
size_t size;
CVPixelBufferRef pixbuf = NULL;
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GstBuffer *buf;
GstCoreVideoMeta *meta;
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guint width, height, n_planes, i;
gsize offset[GST_VIDEO_MAX_PLANES];
gint stride[GST_VIDEO_MAX_PLANES];
if (CFGetTypeID (cvbuf) != CVPixelBufferGetTypeID ())
/* TODO: Do we need to handle other buffer types? */
goto error;
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pixbuf = (CVPixelBufferRef) cvbuf;
if (CVPixelBufferLockBaseAddress (pixbuf,
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kCVPixelBufferLock_ReadOnly) != kCVReturnSuccess) {
goto error;
}
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buf = gst_buffer_new ();
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/* add the corevideo meta to free the underlying corevideo buffer */
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meta = (GstCoreVideoMeta *) gst_buffer_add_meta (buf,
gst_core_video_meta_get_info (), NULL);
meta->cvbuf = CVBufferRetain (cvbuf);
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meta->pixbuf = pixbuf;
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/* set stride, offset and size */
memset (&offset, 0, sizeof (offset));
memset (&stride, 0, sizeof (stride));
data = CVPixelBufferGetBaseAddress (pixbuf);
height = CVPixelBufferGetHeight (pixbuf);
if (CVPixelBufferIsPlanar (pixbuf)) {
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GstVideoInfo tmp_vinfo;
n_planes = CVPixelBufferGetPlaneCount (pixbuf);
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for (i = 0; i < n_planes; ++i)
stride[i] = CVPixelBufferGetBytesPerRowOfPlane (pixbuf, i);
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gst_video_info_init (&tmp_vinfo);
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gst_video_info_set_format (&tmp_vinfo,
vinfo->finfo->format, stride[0], height);
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offset[1] = tmp_vinfo.offset[1];
size = tmp_vinfo.size;
} else {
n_planes = 1;
stride[0] = CVPixelBufferGetBytesPerRow (pixbuf);
size = stride[0] * height;
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}
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gst_buffer_append_memory (buf,
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gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE, data,
size, 0, size, NULL, NULL));
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if (vinfo) {
GstVideoMeta *video_meta;
width = vinfo->width;
video_meta =
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gst_buffer_add_video_meta_full (buf, GST_VIDEO_FRAME_FLAG_NONE,
vinfo->finfo->format, width, height, n_planes, offset, stride);
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}
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return buf;
error:
return NULL;
}